@article{ref1,
title="Spondylolysis-spondylolisthesis and accident",
journal="Archiv fur Orthopadische und Unfall-Chirurgie",
year="1960",
author="Zemp, J.",
volume="51",
number="",
pages="645-658",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0003-9330",
doi="",
url="http://dx.doi.org/"
}